應科院ARM9E
ITU-T DTMF 編碼器(暫時只提供英文版本) |
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Processor
ARM ARM9E family and above with DSP extensions
Background
DTMF (Dual-Tone Multi-Frequency) is the most common signaling
method used within the telephone network, and has now largely
replaced loop disconnect ("pulse") dialing. DTMF
works by employing pairs of tones to code the digits 0-9,
#, * and A-D. DTMF are now also being used for callers to
service centers to select desired services via telephones.
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Implementation
according to ITU-T Q23 and Q24 |
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DTMF
signal sampling frequencies: 8KHz |
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Provides
mono output |
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| ASTRI
Specific Features |
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Provides
multiple-encoder instance
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User-defined
signal durations for operation and non-operation
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User-defined
signal levels on-the-fly
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Provides
API for streaming application
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OS
compatibility: Embedded Linux (Monta Vista, Candenux),
Non-OS, ARM RealView
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Memory requirements: 12KByte (Program and Data) |
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| Performance |
| ASTRI
ARM9E ITU-T DTMF encoder is optimized for the ARM9E architecture.
The performance is depended on several factors of the target
ARM9E platform: |
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I-Cache
size |
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D-Cache
size |
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SDRAM
speed |
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Availability of TCM |
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| Please
make enquires on the performance for a specific ARM9E platform. |
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